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Home My WebLink AboutR-383603PERMEABLE PAVEMENT NOTES: 1. ONE OF THE FOLLOWING TYPES OF PERMEABLE PAVEMENT MUST BE USED • POROUS CONCRETE • POROUS ASPHALTIC • PERMEABLE PAVERS • MODULAR GRID PAVEMENT • GRASSED MODULAR GRID PAVEMENT 2. PERMEABLE PAVEMENTS SHALL BE INSTALLED IN ACCORDANCE WITH THE MANUFACTURER'S SPECIFICATIONS, EXCEPT WHEN SUCH SPECIFICATIONS ARE LESS STRINGENT THAN THOSE SET FORTH IN SECTIONS C.2.6.2 THROUGH C.2.6.6. OF APPENDIX C OF THE 2005 KING COUNTY SURFACE WATER DESIGN MANUAL, 3. PERMEABLE PAVEMENTS SHALL NOT BE PLACED ON SLOPES STEEPER THAT 10%. MAINTENANCE INSTRUCTIONS FOR NON—VEGETATED PERMEABLE PAVEMENT YOUR PROPERTY CONTAINS A STORMWATER MANAGEMENT FLOW CONTROL BMP (BEST MANAGEMENT PRACTICE) CALLED "PERMEABLE PAVEMENT," WHICH WAS INSTALLED TO MINIMIZE THE STORMWATER QUANTITY AND QUALITY IMPACTS OF SOME OR ALL OF THE PAVED SURFACES ON YOUR PROPERTY. PERMEABLE PAVEMENTS REDUCE THE AMOUNT OF RAINFALL THAT BECOMES RUNOFF BY ALLOWING WATER TO SEEP THROUGH THE PAVEMENT INTO A FREE—DRAINING GRAVEL OR SAND BED, WHERE IT CAN BE INFILTRATED INTO THE GROUND. THE TYPE OF PERMEABLE PAVEMENT USED ON YOUR PROPERTY MAY BE ONE OF THE FOLLOWING: POROUS CONCRETE, POROUS ASPHALTIC CONCRETE, PERMEABLE PAVERS OR MODULAR GRID PAVEMENT. THE AREA COVERED BY PERMEABLE PAVEMENT AS DEPICTED BY THE FLOW CONTROL BMP SITE PLAN AND DESIGN DETAILS MUST BE MAINTAINED AS PERMEABLE PAVEMENT AND MAY NOT BE CHANGED WITHOUT WRITTEN APPROVAL EITHER FROM THE KING COUNTY WATER AND LAND RESOURCES DIVISION OR THROUGH A FUTURE DEVELOPMENT PERMIT FROM KING COUNTY. PERMEABLE PAVEMENTS MUST BE INSPECTED AFTER ONE MAJOR STORM EACH YEAR TO MAKE SURE IT IS WORKING PROPERLY. PROLONGED PONDING OR STANDING WATER ON THE PAVEMENT SURFACE IS A SIGN THAT THE SYSTEM IS DEFECTIVE AND MAY NEED TO BE REPLACED. IF THIS OCCURS, CONTACT THE PAVEMENT INSTALLER OR THE KING COUNTY WATER AND LAND RESOURCES DIVISION FOR FURTHER INSTRUCTIONS. A TYPICAL PERMEABLE PAVEMENT SYSTEM HAS A LIFE EXPECTANCY OF APPROXIMATELY 25—YEARS. TO HELP EXTEND THE USEFUL LIFE OF THE SYSTEM, THE SURFACE OF THE PERMEABLE PAVEMENT SHOULD BE KEPT CLEAN AND FREE OF LEAVES, DEBRIS, AND SEDIMENT THROUGH REGULAR SWEEPING OR VACUUM SWEEPING. THE OWNER IS RESPONSIBLE FOR THE REPAIR OF ALL RUTS, DEFORMATION, AND/OR BROKEN PAVING UNITS. MAINTENANCE INSTRUCTIONS FOR VEGETATED PERME PAVEM EN T YOUR PROPERTY CONTAINS A STORMWATER MANAGEMENT FLOW CONTROL BMP (BEST MANAGEMENT PRACTICE) CALLED "GRASSED MODULAR GRID PAVEMENT," WHICH WAS INSTALLED TO MINIMIZE THE STORMWATER QUANTITY AND QUALITY IMPACTS OF SOME OR ALL OF THE PAVED SURFACES ON YOUR PROPERTY. GRASS MODULAR GRID PAVEMENT HAS THE RUNOFF CHARACTERISTICS OF A LAWN WHILE PROVIDING THE WEIGHT—BEARING CAPACITY OF CONCRETE PAVEMENT. THE GRASSED SURFACE NOT ONLY MINIMIZES RUNOFF QUANTITY, IT HELPS TO FILTER POLLUTANTS GENERATED BY VEHICULAR USE OF THE SURFACE. THE COMPOSITION AND AREA OF GRASSED MODULAR GRID PAVEMENT AS DEPICTED BY THE FLOW CONTROL BMP SITE PLAN AND DESIGN DETAILS MUST BE MAINTAINED AND MAY NOT BE CHANGED WITHOUT WRITTEN APPROVAL EITHER FROM THE KING COUNTY WATER AND LAND RESOURCES DIVISION OR THROUGH A FUTURE DEVELOPMENT PERMIT FROM KING COUNTY. GRASSED MODULAR GRID PAVEMENT MUST BE INSPECTED AFTER ONE MAJOR STORM EACH YEAR TO MAKE SURE IT IS WORKING PROPERLY. PROLONGED PONDING OR STANDING WATER ON THE PAVEMENT SURFACE IS A SIGN THAT THE SYSTEM IS DEFECTIVE AND MAY NEED TO BE REPLACED. IF THIS OCCURS, CONTACT THE PAVEMENT INSTALLER OR THE KING COUNTY WATER AND LAND RESOURCES DIVISION FOR FURTHER INSTRUCTIONS, THE GRASSED SURFACE OF THE PAVEMENT MUST BE REGULARLY MOWED AND MAINTAINED IN A GOOD CONDITION. BARE SPOTS MUST BE REPLANTED IN THE SPRING OR FALL. CHECKED FOR COMPLIANCE TO CITY STANDARDS RE I IONS N0. DATE C>F3'FlC>N <::>F--- S 1/4 E3W 11/4 EC:�_ 28.) T -23N7 Fl -,5, W.M. KING COUNTY DESIGN MANUAL - C.2.6.2 POROUS CONCRETE POROUS CONCRETE CONSISTS OF A MIX OF AGGREGATE, CEMENT PASTE, WATER AND ADMIXTURES, BUT CONTAINS LESS FINE AGGREGATE THAN CONVENTIONAL CONCRETE. VOIDS IN THE HARDENED CONCRETE ALLOW WATER TO DRAIN THROUGH THE SURFACE INTO THE SUBGRADE. USES: SIDEWALKS, PATIOS, PARKING AREAS, AND DRIVEWAYS. DESIGN SPECIFICATIONS 1. A MINIMUM OF 6 INCHES OF FREE -DRAINING SAND OR GRAVEL BASE IS REQUIRED UNDER THE POROUS CONCRETE SURFACE. C.2.6 PERMEABLE PAVEMENT 2009 SURFACE WATER DESIGN MANUAL -APPENDIX C 1/9/2009 C-65 2. THE FREE -DRAINING BASE SHALL HAVE LESS THAN 5 % FINES (MATERIAL PASSING THE #200 SIEVE) BASED ON THE FRACTION PASSING THE #4 SIEVE. 3. THE 'POROUS CONCRETE PAVEMENT SHALL BE PERMEABLE ENOUGH TO ABSORB WATER AT A MINIMUM RATE OF 10 INCHES PER HOUR IMMEDIATELY AFTER THE PAVEMENT SURFACE HAS BEEN WETTED CONTINUOUSLY FOR AT LEAST 10 MINUTES. COMPLIANCE WITH THIS MINIMUM RATE SHALL BE CHECKED PRIOR TO CONSTRUCTION APPROVAL OF THE PAVEMENT. COMPLIANCE MAY BE CHECKED USING A SIMPLE BUCKET TEST IN WHICH 5 GALLONS OF WAT'--R ARE POURED ONTO THE PAVEMENT SURFACE ALL AT ONCE FROM A 5 -GALLON BUCKET. IF NOTHING BUT A SCANT AMOUNT OF WATER PUDDLES OR RUNS OFF THE SURFACE, THEN THE PAVEMENT IS CONSIDERED TO MEET THE MINIMUM RATE OF ABSORPTION. IF THIS TEST IS NOT CONCLUSIVE, THEN A 6 -INCH RING SEALED AT THE BASE TO THE PAVEMENT SURFACE SHALL BE USED TO MEASURE THE ACTUAL RATE OF ABSORPTION. 4. POROUS CONCRETE SIDEWALKS PLACED IN COUNTY ROAD RIGHT-OF-WAY (NOTE THAT A ROAD VARIANCE IS REQUIRED FOR SUCH PLACEMENT) OR ON PRIVATE PROPERTY SUBJECT TO VEHICLE LOADING SHALL BE A MINIMUM OF 5 INCHES THICK AND SHALL HAVE A MINIMUM 28 -DAY COMPRESSIVE STRENGTH OF 3000 PSI. 5. SIDEWALKS AND PATIOS ON PRIVATE PROPERTY NOT SUBJECT TO VEHICLES SHALL BE A MINIMUM OF 4 INCHES THICK AND SHOULD HAVE A MINIMUM 28 -DAY COMPRESSIVE STRENGTH OF 2000 PSI. •..•.• • • • IF •MOSS •• •. • ► • --• - • • • • • • • • -• • rt • . 0 . 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FLOW CONTROL MH RIM=390.72 IE(W)=381.27 36" IE(NE)=384.47 OVERFLOW=386.38 18" VIJIvII I III L 11 RIM=390.26 IE(SW)=384.61 IE(N,SE)=385.17 CALL I-800-424--5555 BEFORE YOU DIG ... 0 SANITARY SEWER MANHOLE (❑ STORM DRAIN MANHOLE ® STORM DRAIN CATCH BASIN —� EX. CULVERT POWER TRANSFORMER ❑T CABLE TV RISER E-- UTILITY POLE ANCHOR -O- UTILITY POLE POWER POLE WITH DROP 1 POWER POLE WITH DROP&TBOX POWER POLE WITH DROP&LIGHT —OHP— OVERHEAD POVER EXISTING SIGN ❑ TELEPHONE RISER o MAIL BOX FIRE HYDRANT ® WATER METER WATER VALVE WOOD FENCE (WDF) —x—x— CHAIN LINK FENCE {CLF) CCS EX. ROCKERY EX. PAVEMENT EX. GRAVEL EX. CONCRETE FIR TREE CEDAR TREE ALDER NEW PERVIOUS PAVEMENT SEE NOTES AND SPECIFICATIONS SHEET 3 NEW PERVIOUS CONCRETE SEE NOTES AND SPECIFICATIONS SHEET 3 R-383603 �o� PRE PARE. By S�'`E ' TI — — nnT� T MEMIN 8627 NE I 80th sc. � U SII � I � G � � 0 W V�1 �I 0 C� SS T E Y BOTHELL, wa 9ao11D�AINAG� PHONE: (206)CLIENT: cENT: V Y PROPERTIES L L C ENGINEERING FAX*- (425) 486-0267 °L^°IMIR°R°FIAK PLAN 15012 SF_ 253RD PLACE EMAIL: benanstey@j*uno.com covINcroN, wn 98042 Lo D n n 0 0 1 e� c)